Upon arrival, system is incoff mode on thermostat. Furnace controlcboard is not showing and current codes. Turned on heating at thermostat to test run operation. Inducer motor kicks on for approximately 3-5 seconds before shutting off and the blower motor kicks on while control board is showing code 6 for reverse polarity or 8mproper ground. Upon deeper inspection, found that the inducer motor is pulling approximately 2.5A on startup, and for the 2-3 seconds of full speed operation, it is operating at 1.7A while being rated for 1.35A. The loud screeching noises previously heard are suspected to be the initial signs of Inducer motor failure. Due to the high Amp draw of the motor, the internal control board relay is failing to keep up and the control board goes into a code 6. Replaced faulty inducer motor with new oem inducer motor. Test run operation in heating mode from control board. System is operating in heating at this time.